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Chinese Journal of High Pressure Physics  > 2009  >  23(1): 9-16 .
ZHANG Guang-Qiang, XU Yue, SUN Jing-Shu, XU Da-Peng, WANG De-Yong, ZHANG Lin, XUE Yan-Feng, SONG Geng-Xin, LIU Xiao-Mei, SU Wen-Hui. p-T Phase Diagram of Coesite Synthesized from Nanometer SiO2 Powder[J]. Chinese Journal of High Pressure Physics, 2009, 23(1): 9-16 . doi: 10.11858/gywlxb.2009.01.002
Citation: ZHANG Guang-Qiang, XU Yue, SUN Jing-Shu, XU Da-Peng, WANG De-Yong, ZHANG Lin, XUE Yan-Feng, SONG Geng-Xin, LIU Xiao-Mei, SU Wen-Hui. p-T Phase Diagram of Coesite Synthesized from Nanometer SiO2 Powder[J]. Chinese Journal of High Pressure Physics, 2009, 23(1): 9-16 . doi: 10.11858/gywlxb.2009.01.002
shu

p-T Phase Diagram of Coesite Synthesized from Nanometer SiO2 Powder

doi: 10.11858/gywlxb.2009.01.002
  • 1.

    College of Physics, Jilin University, Changchun 130023, China;

  • 2.

    Test Science Experiment Center, Jilin University, Changchun 130023, China;

  • 3.

    Center for Condensed Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China;

  • 4.

    International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015, China

More Information
  • Corresponding author: XU Da-Peng
  • Received Date: 04 Mar 2008
  • Rev Recd Date: 07 Apr 2008
  • Publish Date: 15 Feb 2009
    Abstract
  • With nanometer SiO2 powder as initial material, the p-T phase diagram (2.0～4.2 GPa, 150～1200 ℃) of -quartz and coesite was obtained by a series of experiments under high pressure and high temperature, and the slope of the boundary in the phase diagram is negative below 650 ℃ and is basically horizontal above 650 ℃. By means of transmission electron microscopy (TEM), X-ray diffractometer (XRD), Raman spectrometry (Raman), fourier transform infrared spectrometry (FT-IR), thermogravimetry and differential thermal analysis measurements (TG-DTA), the phenomenon that the water in the nanometer SiO2 can decrease the synthesis temperature of coesite and quicken reaction velocity was found, and the nanometer SiO2 can be crystallized into coesite under 4.2 GPa and 190 ℃, which is much lower than the synthesis temperatures of coesite that have been reported. Under ambient pressure, the coesite synthesized from nanometer SiO2 can stably exist at 800 ℃ and is transformed into cristobalite above 1 000 ℃.

     

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